Javascript - How to push an array to a multidimensional array

Question

I trying to push an array I've generated to a multidimensional array, and for some reason the value of all the other positions in the array's values, are the same as the value I just pushed.

For example: I do

var grades = [];
for(var i = 0; i < num_qes + 1; i++){
 var grade = [0, 0, 0, 0];
 grade[0] = i;
 for(var n = 0; n < num_qes+ 1; n++){
 grade[1] = n;
 for(var f = 0; f < num_qes+ 1; f++){
 grade[2] = f;
 for(var t = 0; t < num_qes+ 1; t++){
 grade[3] = t;
 allGrad = grade[0] + grade[1] + grade[2] + grade[3];
 //println(allGrad);
 if(allGrad === num_qes){
 grades.push(grade);
 }
 }
 }
 }

Here at the end I check to see if all of the values in my generated array are exactly equal to the number of questions.

 if(allGrad === num_qes){
 grades.push(grade);
 }

Let's say that grade = [9, 1, 0, 0], when I push this value to the multidimensional array, grades, all the values change to [9, 1, 0, 0]. So the multidimensional array looks like this: [[9, 1, 0, 0], [9, 1, 0, 0], [9, 1, 0, 0]], when it SHOULD look like this: [[9, 0, 0, 1], [9, 0, 1, 0], [9, 1, 0, 0]].

I hope what I said make senses, and thanks in advance for ansnewing.

The jsfiddle is right here

• Kiril: Could you add a jsfiddle with a not-working example for better understanding please.
• Quantumplate: Are you trying to get all combinations where the sum of the 4 values equals num_qes?
• TheRailsRouter: Yes, I only need all the combinations where the sum is 4.
• TheRailsRouter: The jsfiddle is right here, I'm trying to get the page to display the results.

Answer 1

Is this what you are after?

var grades = [];
var num_qes = 4;
for(var i = 0; i <= num_qes; i++){
 for(var n = 0; n <= num_qes; n++){
 for(var f = 0; f <= num_qes; f++){
 for(var t = 0; t <= num_qes; t++){
 var sum = i + n + f + t;
 if(sum === num_qes){
 console.log(i + ',' + n + ',' + f + ',' + t);
 var grade = [i, n, f, t];
 grades.push(grade);
 }
 }
 }
 }
}

Notes:

• I've replaced i < num_qes + 1 with i <= num_ques for simplicity
• Only creating the grade array in the inner loop when your condition is met (makes it much more readable)
• Summing the numbers directly rather than reading from the grade array you've just populated (again more readable)
• Using console.log() to output results that match criteria

Results in console look like this...

0,0,0,4
0,0,1,3
0,0,2,2
0,0,3,1
0,0,4,0
0,1,0,3
0,1,1,2
0,1,2,1
0,1,3,0
etc

• TheRailsRouter: I'll try this out, Thank!
• TheRailsRouter: I still have other problems, but I'll figure those out on my own
• Quantumplate: What are your other problems? Writing results to the html page?
• TheRailsRouter: I figured out the problem.